Improvement in pressure-regulators and steam-blowers



UNITED STATES PATENT OFFICE.

DAVID l. lAXG'S, OF MEDFOID, AND JOSHUA GRAY, OF BOSTON, MASS.

.IMPROVMENT IN PRESSURE-REGULATORS AND STEAM-BLOWERS..

Speciiieat-ion forming part of Letters Patent No. 152,063, dated June 16, 1874; application filed May 22, 1871i.

To all whom lit may concern:

Be it known that we,DAv1n E. BANGs, of Medford, in the county of Middlesex and State ot' Massachusetts, and JOSHUA GRAY, of Boston, in the county of Suffolk, same State, have invented certain Improvements in a Pressure- Regulator in connection with Steam-Blower, of which the following is a specification, reference being had to the accompanying drawings, in which` Figure l is a side elevation of the blowing apparatus. Fig. 2 is a vertical section of the pressure-regulator, and Fig. 3 is a plan or top view of the entire apparatus.

Our apparatus is intended to be used for a variety of purposes, in which a steady and uniform draft of air is desired; and it consists in the peculiar construction of the pressure-regulating apparatus, by which we are enabled to control the draft automatically, so as to secure uniformity in the air-currents .applied to the work, notwithstanding variations may occur in thenumber of such currents, and in the original force of the currents supplied to the blower, all as hereinafter more fully set forth.

In the drawings the same letter marks the same part wherever it occurs.

A is a holder, having an inside jacket, B, between Which and the walls ofthe holder is an annular space, C, which is supplied with vwater, in which a bell, D, plays vertically7 after the manner of a gasometer-bell, its position varying with the quantity and tension of the air which it contains. E is an apparatus for the production of superheated steam to be supplied to the bell I), as hereinafter stated. The bell D is provided at top with a valve, F, which opens downward, and is closed by a spring. When the bell D rises to the limit of its upward movement the valve F is forced openby the pin or stop G, and relieves the pressure on the interior of the bell. His a water-tank connected with the steam-boilerK by the bent pipe I, closed at its end within the boiler by the ball-valve J. rIhis forms an automatic filler for the boiler K. From the reservoir E, where the steam is superheated, said steam is conveyed by a suitable pipe, I, and introduced in a jet into the flaring mouth of a large pipe, L, leading to the interior of the holder A, as shown in Fig. 2.

The pipe L is provided at its upper end with a stopcock or valve, Q.

In Fig. 2 we have shown, at m, one of the blast-pipes through which the air-current is conveyed to the point at which its work is to be done. In practice we contemplate the use of a number of such pipes, any one or more of which may be used when desired.

rIhe operation is as follows: The steam-jet introduced into pipe L from reservoir E causes .air to enter with great force into the holder A,

and to raise the bell D, the height of which will indicate the quantity and pressure of the air within it. The air thus supplied. is conveyed to the point at which the blast is desired through any number of blast-pipes m, controlled by suitable valves. When the pressure in the holder A is sufficient to raise the bell to the limit of its upward movement, the valve F is forced open by the pin G, and the pressure is relieved.

It will be observed that this method of opening the valve gives a very delicate and perfeet control over the pressure in the bell. In

ease three blast-pipes, for example, are being used and two of them should be suddenly shut off, there would be an immediate increase of pressure in the holder, which would manifest itself and be relieved by the rise of the bell. Should the pressure continue to increase the bell would continue to rise till relieved by the valve. Then the blasts which were shut off are reopened the bell descends by gravity and maintains the uniformity of the pressure, thus forming a delicate and effectual governor, equalizing the draft in all the blast-pipes supplied by the holder, however varied in num ber.

Having thus described our invention, what we claim, and desire to secure by Letters Iatent, is-

The combination of the steam-pipe I), airpipe L, holder A, and bell D, provided with the valve F, operated by stop G, all constructed and operated in the manner and for the purpose specified.l

DAVID E. BANGS. JOSHUA GRAY.

Witnesses IsAAc H. PARKER., .TAnns N .AL. 

